Order Of Australia led home a one-two-three for trainer Aidan O'Brien with a shock victory in the Breeders’ Cup Mile at Keeneland.
The three-year-old colt only got into the race after One Master was scratched on Thursday.
His jockey Pierre-Charles Boudot himself only got the ride after Christophe Soumillon tested positive for Covid-19 and completed an unlikely double after he also replaced Ioritz Mendizabal on Audarya in the Breeders’ Cup Filly & Mare Turf.
Order Of Australia had only won two of his seven previous races and had fallen short in two previous attempts at the top level – but he came good when it mattered, to give O’Brien his first win in the race.
Halladay made the running until the straight, where there was all to play for until Order Of Australia swept on the outside to take the honours under another confident ride by Boudot.
The son of Australia kept on to hold his stablemates Circus Maximus and Lope Y Fernandez, giving Ballydoyle a remarkable clean sweep.
Kameko, the 2000 Guineas winner, had every chance under Oisin Murphy but finished out of the places, as did Irish Guineas victor Siskin.
Order Of Australia returned a US starting price of 732-10, but a British and Irish industry SP of just 40-1. Circus Maximus was 113-10 (B&I SP 12-1), with Lope Y Fernandez 18-1 (B&I SP 12-1).
O’Brien said: "We always thought that as the season went on a mile on fast ground on a flat track would be ideal for Order Of Australia.
"He’s a horse that quicken very well and he had been working well."
Boudot – who would have ridden the William Haggas-trained One Master – said: "I spoke to Aidan, who was very confident about this horse. He said I should be positive and as he is fast and a proper horse I should ride him from on the pace.
"He travelled very nicely throughout and produced a good turn of foot when I asked him."
He added: "Christophe gave off a positive test for Covid and my horse got into the race as One Master was a non runner.
"It’s a dream come true for me and I’m thankful to my agent, who must be one of the best in the world."
Kameko’s rider Oisin Murphy said: "I got him into the perfect position that I wanted going down the back. I thought the track would suit him and that he would travel, but he didn’t pick up.
"While this is disappointing, it doesn’t indicate how good he is. It’s just that he has trained hard all year, he’ll make a wonderful stallion."
Colin Keane said of Siskin: "He behaved himself down at the stalls, but gave me the impression in the race that the year had caught up with him."
Glass Slippers (US SP 102-10, B&I SP 8-1) gave Europe a first ever victory in the Breeders' Cup Turf Sprint when striking for trainer Kevin Ryan.
Winner of the Prix de l'Abbaye in 2019 and just touched off from a poor draw in last month's renewal, the four-year-old filly showed just how much she thrives in the latter part of the campaign with a dramatic success.
Glass Slippers was not the best out of the gates and Tom Eaves was happy to place her towards the rear of the field, but near the rail.
Up front, Bombard and Into Mystic shared the early pace with Wildman Jack, Texas Wedge and Leinster joining in as the runners approached the top of the stretch.
At that point, Eaves started to make his move on Glass Slippers, who was helped when a gap appeared as the early trail-blazers started to go back.
Glass Slippers responded in game fashion and galloped on strongly all the way to the line, scoring by half a length from Wet Your Whistle with Leinster third.
Newmarket trainer James Fanshawe struck with his first runner in the Breeders' Cup when Audarya (US SP 178-10, B&I SP 12-1) came with a late run to claim the Filly & Mare Turf.
The four-year-old had stepped up to the mark at the top level with victory in the Prix Jean Romanet and third place in the Prix de l'Opera on her opening two attempts, and did so again with a determined effort.
There was drama at the start when Starship Jubilee unseated her rider Florent Geroux after stumbling coming out of the stalls.
Shane Foley rushed up the Jessica Harrington-trained Cayenne Pepper from her wide draw to lead by the first turn, with the main American hopefuls Mean Mary and Rushing Fall close by.
They looked like fighting out the finish once Cayenne Pepper had weakened by the home turn - but Pierre-Charles Boudot and Audarya had other ideas.
She hit the front in the final furlong and battled on gamely to score by a neck from Rushing Fall, with Harvey's Lil Goil half a length away in third place.
